Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6329715b95f14e…

MALICIOUS

PDF

43.1 KB Created: 2020-05-30 22:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce738460fa6a8bffe9f27a743442360a SHA-1: b3654c70e180c93a54b8915605f6f95fd6b5dd1d SHA-256: 3d6329715b95f14e9b7548f72cc63ffc5ed5577b14c60b1aa920b39bcccfeffd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded links to external websites, a common tactic for SEO link farms and potentially distributing further malicious content. The document body, though partially obfuscated, references 'nursing diagnosis for hypokalemia', suggesting a lure to attract victims. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://8b.undesirable.us/uploads/1/3/1/3/131384559/131384559.html#nursing+diagnosis+for+hypokalemia
    • http://under-pressure-fl.com/uploads/1/3/0/7/130775424/vivapanilivat-gixaromerum-kalubo-powakuloxe.pdf
    • http://mycruzada.com/uploads/1/3/0/7/130738632/32604f26.pdf
    • http://katnsag.us/uploads/1/3/1/3/131383588/eb3ca.pdf
    • http://dawnburridge.com/uploads/1/3/0/4/130483390/kikikuba-mavigi-dajaxema-dozugitufumokaz.pdf
    • http://amikrecords.com/uploads/1/3/1/0/131071056/damowupokakone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c07.bin
7c3540ae5746f5ac33371907c7759ade02256cf3b281245aa3ba5ea1bdafda30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 10648 bytes

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